In a chemistry lesson in school one day, I was forcing a glass tube through a holed rubber bung with some force. Glass tubes and twisting don't go well together -- The tube shattered in my hand into about 6 pieces and the pushing force I was applying buried a small shard of glass deep into my finger. I pulled it out and it bled heavily. Much numbness as well. Maybe it caught an artery? I have a scar there now. If I press and wriggle it, it sometimes stings. I have often wondered if some of the glass is still in there.
But besides this I'm generally not prone to accidents and injuries.